1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
// Copyright 2015, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "vixl/utils.h"
#include <stdio.h>
namespace vixl {
uint32_t float_to_rawbits(float value) {
uint32_t bits = 0;
memcpy(&bits, &value, 4);
return bits;
}
uint64_t double_to_rawbits(double value) {
uint64_t bits = 0;
memcpy(&bits, &value, 8);
return bits;
}
float rawbits_to_float(uint32_t bits) {
float value = 0.0;
memcpy(&value, &bits, 4);
return value;
}
double rawbits_to_double(uint64_t bits) {
double value = 0.0;
memcpy(&value, &bits, 8);
return value;
}
uint32_t float_sign(float val) {
uint32_t rawbits = float_to_rawbits(val);
return unsigned_bitextract_32(31, 31, rawbits);
}
uint32_t float_exp(float val) {
uint32_t rawbits = float_to_rawbits(val);
return unsigned_bitextract_32(30, 23, rawbits);
}
uint32_t float_mantissa(float val) {
uint32_t rawbits = float_to_rawbits(val);
return unsigned_bitextract_32(22, 0, rawbits);
}
uint32_t double_sign(double val) {
uint64_t rawbits = double_to_rawbits(val);
return static_cast<uint32_t>(unsigned_bitextract_64(63, 63, rawbits));
}
uint32_t double_exp(double val) {
uint64_t rawbits = double_to_rawbits(val);
return static_cast<uint32_t>(unsigned_bitextract_64(62, 52, rawbits));
}
uint64_t double_mantissa(double val) {
uint64_t rawbits = double_to_rawbits(val);
return unsigned_bitextract_64(51, 0, rawbits);
}
float float_pack(uint32_t sign, uint32_t exp, uint32_t mantissa) {
uint32_t bits = (sign << 31) | (exp << 23) | mantissa;
return rawbits_to_float(bits);
}
double double_pack(uint64_t sign, uint64_t exp, uint64_t mantissa) {
uint64_t bits = (sign << 63) | (exp << 52) | mantissa;
return rawbits_to_double(bits);
}
int float16classify(float16 value) {
uint16_t exponent_max = (1 << 5) - 1;
uint16_t exponent_mask = exponent_max << 10;
uint16_t mantissa_mask = (1 << 10) - 1;
uint16_t exponent = (value & exponent_mask) >> 10;
uint16_t mantissa = value & mantissa_mask;
if (exponent == 0) {
if (mantissa == 0) {
return FP_ZERO;
}
return FP_SUBNORMAL;
} else if (exponent == exponent_max) {
if (mantissa == 0) {
return FP_INFINITE;
}
return FP_NAN;
}
return FP_NORMAL;
}
unsigned CountClearHalfWords(uint64_t imm, unsigned reg_size) {
VIXL_ASSERT((reg_size % 8) == 0);
int count = 0;
for (unsigned i = 0; i < (reg_size / 16); i++) {
if ((imm & 0xffff) == 0) {
count++;
}
imm >>= 16;
}
return count;
}
} // namespace vixl
|
